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Alatage Mountain 047
Basic information Name: Alatage Mountain 047
     This is an OFFICIAL meteorite name.
Abbreviation: AM 047
Observed fall: No
Year found: 2012
Country: China
Mass:help 50 kg
Classification
  history:
Recommended:  L-melt rock    [explanation]

This is 1 of 44 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jun 2021
Writeuphelp
Writeup from MB 110:

Alatage Mountain 047 (AM 047)        41.683°N, 92.933°E

Xinjiang, China

Find: 2012 Sep

Classification: Ordinary chondrite (L, melt rock)

History: Found by geologist Jianming Wang in September 2012 while they were conducting fieldwork in the Alatage Mountain region, Xinjiang Province, China.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen retains remnants of a clastic breccia structure, but textural features indicate that it has been pervasively melted. Composed predominantly of extremely fine-grained silicate-rich regions containing sporadic spherical sulfide globules. Silicate-rich regions contain some larger olivine grains, but consist mainly of tiny prismatic grains of olivine and pyroxene (zoned from low-Ca pyroxene cores to subcalcic augite rims) together with interstitial sodic plagioclase and accessory troilite, pentlandite, merrillite, chlorapatite and rare taenite. Kamacite is apparently absent. Sulfide globules are composed of troilite+pentlandite, are in places rimmed by phosphates, and exhibit secondary staining by iron oxides and iron chloride.

Geochemistry: Olivine (Fa24.2±0.7, range Fa23.2-25.0, N = 5), low-Ca pyroxene (Fs20.4±0.7Wo3.0±0.6, range Fs19.9-21.5Wo2.4=3.9, N = 4), subcalcic augite (Fs14.7±0.2Wo32.4±2.3, range Fs14.6-14.9Wo30.9-35.0, N = 3).

Classification: Ordinary chondrite (L-melt rock).

Specimens: 42.8 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Xinjiang
Date:2012 Sep
Latitude:41.683°N
Longitude:92.933°E
Mass (g):50000
Pieces:many
Class:L-melt rock
Shock stage:S6
Weathering grade:W1
Fayalite (mol%):24.2±0.7
Ferrosilite (mol%):20.4±0.7
Wollastonite (mol%):3.0±0.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):42.8
Type spec location:UWB
Main mass:WangZ
Finder:J. Wang
Comments:Work name WZY-20; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

China
Coordinates:
     Recommended::   (41° 40' 59"N, 92° 55' 59"E)

Statistics:
     This is 1 of 292 approved meteorites from Xinjiang, China (plus 5 unapproved names)
     This is 1 of 455 approved meteorites from China (plus 10 unapproved names) (plus 1 impact crater)
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